Pakistan's opposition leader Nawaz Sharif on Tuesday gave the beleaguered government a 72-hour ultimatum to act on several demands, including rollback of a fuel price hike and probe into corruption scandals, failing which the PPP could be booted out from the Punjab government. Sharif, chief of the country's main opposition party the PML-N, did not link the demands to support for the Pakistan People's Party-led government at the centre, which was reduced to a minority after the Muttahida Qaumi Movement withdrew support to it last week. However, sources said his stance was linked to Prime Minister Yousuf Raza Gilani's efforts to seek support from the PML-N on Monday.